Tuning fork



FIG. 1 is a front elevational view of a tuning fork showing my new design;

FIG. 2 is a side elevational view;

FIG. 3 is a view like FIG. 2 with one of the two outer members of the tuning fork removed;

FIG. 4 is a top plan view;

FIG. 5 is a bottom plan view; and

FIG. 6 is a view like FIG. 5 with the outer members shown in section at the location of line 6--6 in FIG. 1. 

The ornamental design for a tuning fork, substantially as shown and described. 